[patch] Staging: sep: potential buffer overflow in ioctl

[Dan Carpenter]

tail_size is determined by several variables that come from the user
so we should verify that it's not too large.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/staging/sep/sep_driver.c b/drivers/staging/sep/sep_driver.c
index 8ac3fae..e624e28 100644
--- a/drivers/staging/sep/sep_driver.c
+++ b/drivers/staging/sep/sep_driver.c
@@ -2120,6 +2120,8 @@ static int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
 			}
 		}
 		if (tail_size) {
+			if (tail_size > sizeof(dcb_table_ptr->tail_data))
+				return -EINVAL;
 			if (is_kva == true) {
 				memcpy(dcb_table_ptr->tail_data,
 					(void *)(app_in_address + data_in_size -